Using axios instance

index.js

@@ -53,8 +53,7 @@ class Analytics {
       enumerable: true,
       value: typeof options.enable === 'boolean' ? options.enable : true
     })
-    this.axiosClient = axios.create()
-    axiosRetry(this.axiosClient, {
+    axiosRetry(this.axiosInstance, {
       retries: options.retryCount || 3,
       retryCondition: this._isErrorRetryable,
       retryDelay: axiosRetry.exponentialDelay
@@ -266,20 +265,17 @@ class Analytics {
     }
 
     const req = {
-      method: 'POST',
-      url: `${this.host}${this.path}`,
       auth: {
         username: this.writeKey
       },
-      data,
       headers
     }
 
     if (this.timeout) {
       req.timeout = typeof this.timeout === 'string' ? ms(this.timeout) : this.timeout
     }
 
-    this.axiosClient(req)
+    this.axiosInstance.post(`${this.host}${this.path}`, data, req)
       .then(() => done())
       .catch(err => {
         if (err.response) {

test.js

@@ -606,6 +606,30 @@ test('ensure that failed requests are not retried forever', async t => {
   await t.throws(client.flush())
 })
 
+test('ensure we can pass our own axios instance', async t => {
+  const axios = require('axios')
+  const myAxiosInstance = axios.create()
+  const stubAxiosPost = stub(myAxiosInstance, 'post').resolves()
+  const client = createClient({
+    axiosInstance: myAxiosInstance,
+    host: 'https://my-dummy-host.com',
+    path: '/test/path'
+  })
+
+  const callback = spy()
+  client.queue = [
+    {
+      message: 'something',
+      callback
+    }
+  ]
+
+  client.flush()
+
+  t.true(stubAxiosPost.called)
+  t.true(stubAxiosPost.alwaysCalledWith('https://my-dummy-host.com/test/path'))
+})
+
 test('ensure other axios clients are not impacted by axios-retry', async t => {
   let client = createClient() // eslint-disable-line
   const axios = require('axios')